Girls please help me!!!

So I've been using glow for 3 months now and some of the stuff I don't know what it is or how to check for it. Please explain it to me I really want my glow as accurate as possible! !!!

* Preformed CM check? (Whats that and how)

*Cervical position? (How do I know)

*Today's bbt (Whats that and how)

*ovulation test (how)

Please help me guys thnd thanks alot